feat: log otel bootstrap errors via nest logger

[shogun444]

Description

Replaces direct console.error calls during OpenTelemetry bootstrap and shutdown with a NestJS Logger instance to ensure SDK lifecycle failures are properly structured and surfaced according to application logging standards.

Closes #1536

Changes

• Structured Logging for OpenTelemetry (src/tracing/opentelemetry.ts):
  • Initialized a NestJS Logger('OpenTelemetry') instance.
  • Replaced raw console.error calls for SDK startup failures and SIGINT/SIGTERM shutdown errors with logger.error(message, error).
  • Removed redundant eslint-disable no-console rule.
• Kept OpenTelemetry internal diagnostic logger (diag) and SDK/exporter initialization intact.

Verification

• pnpm run typecheck: Exit 0 (clean).
• pnpm run lint:ci -- src/tracing/opentelemetry.ts: Exit 0 (clean).
• pnpm jest src/logging --runInBand --forceExit: 4 suites, 61 tests passed.

Acceptance Criteria Checklist

• Tracing start/shutdown failures emitted via logger, not console.error
• CI checks passing
• Starred the repository

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